| 1 | // Test the __VA_ARGS__ comma swallowing extensions of various compiler dialects. |
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| 2 | |
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| 3 | // RUN: %clang_cc1 -E %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
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| 4 | // RUN: %clang_cc1 -E -std=c99 %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
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| 5 | // RUN: %clang_cc1 -E -std=c11 %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
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| 6 | // RUN: %clang_cc1 -E -x c++ %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
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| 7 | // RUN: %clang_cc1 -E -std=gnu99 %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
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| 8 | // RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s |
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| 9 | // RUN: %clang_cc1 -E -DNAMED %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
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| 10 | // RUN: %clang_cc1 -E -std=c99 -DNAMED %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
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| 11 | |
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| 12 | |
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| 13 | #ifndef NAMED |
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| 14 | # define A(...) [ __VA_ARGS__ ] |
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| 15 | # define B(...) [ , __VA_ARGS__ ] |
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| 16 | # define C(...) [ , ## __VA_ARGS__ ] |
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| 17 | # define D(A,...) [ A , ## __VA_ARGS__ ] |
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| 18 | # define E(A,...) [ __VA_ARGS__ ## A ] |
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| 19 | #else |
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| 20 | // These are the GCC named argument versions of the C99-style variadic macros. |
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| 21 | // Note that __VA_ARGS__ *may* be used as the name, this is not prohibited! |
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| 22 | # define A(__VA_ARGS__...) [ __VA_ARGS__ ] |
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| 23 | # define B(__VA_ARGS__...) [ , __VA_ARGS__ ] |
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| 24 | # define C(__VA_ARGS__...) [ , ## __VA_ARGS__ ] |
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| 25 | # define D(A,__VA_ARGS__...) [ A , ## __VA_ARGS__ ] |
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| 26 | # define E(A,__VA_ARGS__...) [ __VA_ARGS__ ## A ] |
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| 27 | #endif |
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| 28 | |
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| 29 | |
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| 30 | 1: A() B() C() D() E() |
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| 31 | 2: A(a) B(a) C(a) D(a) E(a) |
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| 32 | 3: A(,) B(,) C(,) D(,) E(,) |
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| 33 | 4: A(a,b,c) B(a,b,c) C(a,b,c) D(a,b,c) E(a,b,c) |
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| 34 | 5: A(a,b,) B(a,b,) C(a,b,) D(a,b,) |
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| 35 | |
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| 36 | // The GCC ", ## __VA_ARGS__" extension swallows the comma when followed by |
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| 37 | // empty __VA_ARGS__. This extension does not apply in -std=c99 mode, but |
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| 38 | // does apply in C++. |
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| 39 | // |
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| 40 | // GCC: 1: [ ] [ , ] [ ] [ ] [ ] |
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| 41 | // GCC: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
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| 42 | // GCC: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
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| 43 | // GCC: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
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| 44 | // GCC: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
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| 45 | |
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| 46 | // Under C99 standard mode, the GCC ", ## __VA_ARGS__" extension *does not* |
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| 47 | // swallow the comma when followed by empty __VA_ARGS__. |
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| 48 | // |
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| 49 | // C99: 1: [ ] [ , ] [ , ] [ ] [ ] |
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| 50 | // C99: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
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| 51 | // C99: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
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| 52 | // C99: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
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| 53 | // C99: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
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| 54 | |
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| 55 | // Microsoft's extension is on ", __VA_ARGS__" (without explicit ##) where |
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| 56 | // the comma is swallowed when followed by empty __VA_ARGS__. |
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| 57 | // |
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| 58 | // MS: 1: [ ] [ ] [ ] [ ] [ ] |
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| 59 | // MS: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
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| 60 | // MS: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
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| 61 | // MS: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
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| 62 | // MS: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
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| 63 | |
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| 64 | // FIXME: Item 3(d) in MS output should be [ ] not [ , ] |
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| 65 | |
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